[web2py] URGENT: Clarification on Auth

[Pystar]

I am using Facebook's "Registration plugin" which allows users to
either register or login into a 3rd party site using their facebook
account. I would like to know if its possible to get the signed data
from facebook and do a manual insert into the "user" table and still
have auth working? or in other words can I get my user data from
anywhere apart from the auth form, do a manual insert and have auth
work sitewide across my app?
Thanks for your prompt response.